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<head><meta charset="utf-8"><title>Skipping December Meetings · project-portable-simd · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/index.html">project-portable-simd</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html">Skipping December Meetings</a></h3>

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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/219159710" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jubilee <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#219159710">(Dec 08 2020 at 01:02)</a>:</h4>
<p>So I forgot it was Monday. Observationally, so did everyone else. Motion that we skip meetings for December?</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/219159766" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#219159766">(Dec 08 2020 at 01:02)</a>:</h4>
<p>I actually had a meeting and noticed no one else said anything so left it alone <span aria-label="smile" class="emoji emoji-1f642" role="img" title="smile">:smile:</span></p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/219159774" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#219159774">(Dec 08 2020 at 01:02)</a>:</h4>
<p>I'm ok with skipping or not skipping</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/219168169" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Lokathor <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#219168169">(Dec 08 2020 at 03:41)</a>:</h4>
<p>I remembered that it was Monday, but was cleaning the garage at the time, and was kinda on a tight schedule because there's very limited daylight this time of the year.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/220077185" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Ashley Mannix <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#220077185">(Dec 16 2020 at 04:49)</a>:</h4>
<p>We're currently in maximum daylight here, but have a grouchy teething baby so have missed a lot of it. I'm on board with a quiet December to try build up some enthusiasm for next month <span aria-label="smile" class="emoji emoji-1f642" role="img" title="smile">:smile:</span></p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224396672" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jubilee <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224396672">(Jan 28 2021 at 21:43)</a>:</h4>
<p>this turned out to be unusually fortuitous because most of my hardware broke in December, lolsob, and I only just now got back on track w/r/t fixing things up.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224404358" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Lokathor <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224404358">(Jan 28 2021 at 22:35)</a>:</h4>
<p>just get an rpi4 and become even more of our ARM expert than you already are</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224404534" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224404534">(Jan 28 2021 at 22:37)</a>:</h4>
<p>Maybe if we all purge MMX from our brains we can replace it with ARM</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224404656" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224404656">(Jan 28 2021 at 22:38)</a>:</h4>
<p>Is the rpi4 representative of other ARM CPUs? I might need to get one...</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224405786" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jubilee <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224405786">(Jan 28 2021 at 22:50)</a>:</h4>
<p>lolol.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224405985" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jubilee <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224405985">(Jan 28 2021 at 22:52)</a>:</h4>
<p><span class="user-mention" data-user-id="312331">@Caleb Zulawski</span> The RPi4's architecture is aarch64, so I am not sure I would say "representative of other ARM CPUs" because there's a lot of variation, but it's a highly <strong>relevant</strong> one.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224406065" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224406065">(Jan 28 2021 at 22:53)</a>:</h4>
<p>I suppose I meant in terms of performance etc</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224406130" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224406130">(Jan 28 2021 at 22:53)</a>:</h4>
<p>I've worked a lot with aarch64 but only abstractly.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224406323" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224406323">(Jan 28 2021 at 22:56)</a>:</h4>
<p>For example my AMD APU performance isn't remotely similar to most intel CPUs because of AMD's implementation of AVX, I think</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224406388" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224406388">(Jan 28 2021 at 22:56)</a>:</h4>
<p>Not sure if aarch64 has that problem (I would hope not)</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224406481" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Lokathor <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224406481">(Jan 28 2021 at 22:57)</a>:</h4>
<p>it's a quad core uh, 1.4GHz I think</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224406591" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Lokathor <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224406591">(Jan 28 2021 at 22:58)</a>:</h4>
<p>but it's V8 and supports Neon</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224406681" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Lokathor <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224406681">(Jan 28 2021 at 22:59)</a>:</h4>
<p>I actually have two sitting in a box, but no place to put a spare keyboard and screen and such</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224409032" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jubilee <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224409032">(Jan 28 2021 at 23:24)</a>:</h4>
<p><span class="user-mention" data-user-id="312331">@Caleb Zulawski</span> NEON is... reasonably consistent across aarch64, is my (mostly intellectual and abstract on this detail, not as material and tested) understanding.</p>
<p><a href="https://www.cnx-software.com/2017/08/07/how-arm-nerfed-neon-permute-instructions-in-armv8/">https://www.cnx-software.com/2017/08/07/how-arm-nerfed-neon-permute-instructions-in-armv8/</a> is the only case I've seen where it's not, and the RPi 4B will share its perf characteristics with most things because it has a "bigger" core (the A72). Note, however, the RPi 3, which I have, will have different characteristics, for the reasons in that article.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/257879-project-portable-simd/topic/Skipping%20December%20Meetings/near/224413104" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jubilee <a href="https://rust-lang.github.io/zulip_archive/stream/257879-project-portable-simd/topic/Skipping.20December.20Meetings.html#224413104">(Jan 29 2021 at 00:12)</a>:</h4>
<p><a href="https://www.cnx-software.com/2015/04/09/relative-performance-of-arm-cortex-a-32-bit-and-64-bit-cores/">https://www.cnx-software.com/2015/04/09/relative-performance-of-arm-cortex-a-32-bit-and-64-bit-cores/</a> I should note though that just because one op has a weird relative glitch in performance doesn't mean that the results are overall slower. :P</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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